MacViews: Move ui_control_mac's anon::SynthesizeKeyEvent() to cocoa_test_event_utils.h

MacViews: Move ui_control_mac's anon::SynthesizeKeyEvent() to cocoa_test_event_utils.h

ui_controls functions are typically only used in interactive_ui_tests
since it's not supported in sharded test suites.

We want to use its SynthesizeKeyEvent() to generate events in
event_generator_delegate_mac.mm (which is designed for non-interactive
tests and can be sharded).

This CL moves it to cocoa_test_event_utils.h

BUG=378134
Committed: https://crrev.com/332e948d08ddf9522f4132f71dd6120bd3d7deaf
Cr-Commit-Position: refs/heads/master@{#314243}

[tapted, 2015-02-02 22:50:55]

tapted@chromium.org changed reviewers:
+ sadrul@chromium.org

[tapted, 2015-02-02 22:50:55]

Hi sadrul, this is the boring function-move, split out from
http://crrev.com/879253002 . Since you were a reviewer there (and have owners
:), could you please review?

(the bots in crrev/879253002 are all green, but a toolkit_views=1 build on Mac
will break if this doesn't land first)

Thanks!

[sadrul, 2015-02-03 01:17:45]

lgtm

[tapted, 2015-02-03 01:41:32]

The CQ bit was checked by tapted@chromium.org

[commit-bot: I haz the power, 2015-02-03 01:42:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/882053002/20001

[commit-bot: I haz the power, 2015-02-03 02:10:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-03 02:11:34]

Patchset 2 (id:??) landed as
https://crrev.com/332e948d08ddf9522f4132f71dd6120bd3d7deaf
Cr-Commit-Position: refs/heads/master@{#314243}